I was wondering what the best light cycle would be...

20 hours get a light meter about £9 ebay u will probably get away with 400 comfortable

I used to do 24 h light with Good Results. But you have To keep in mind that your Ladys get Thirsty faster. Now I‘m doing autos and Photos in the Same tent. So i have To do 18h or 12h and the Autos Are Great anyway. Ive had the feeling that they Are a Bit faster when you Go with 24h But thats the only difference for me.

18/6 or 20/4 is the best schedule in my opinion, you should start at low wattage and change into bigger wattage when they bloom. since veg is not need a lot of light. 20/4 will be faster flowering in my opinion since i tried both schedule.

Hey fellow grower! For autos you can run 24 lights on. They will flower anyway since they dont flower because of light, but age. You will se when the autos flower. Usually 20-25 days from seed. But. For your question. I ny self run my autos with a little veg light/blue spector 25w the first two weeks. Then i have the light on 20h on and 4 off. When I put them under a bigger light i use 18/6. I have read about pros and cons for 24 on and everything else. But this is producing good results for me. Good luck 🙌